package com.study.feign;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;

/**
 * @Author wfw
 * @Date 2020/07/12 10:31
 */
@Configuration
public class FeignConfiguration {
    /**
     * 配置feign拦截器，解决请求头问题
     */
    @Bean
    public RequestInterceptor requestInterceptor(){

        return new RequestInterceptor() {
            // 获取所有浏览器发送的请求属性，请求头赋值到feign
            @Override
            public void apply(RequestTemplate requestTemplate) {
                // 请求属性
                ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
                if (attributes!=null){
                    HttpServletRequest request = attributes.getRequest();
                    // 获取浏览器发起的请求头
                    Enumeration<String> headerNames = request.getHeaderNames();
                    if(headerNames!=null){
                        while (headerNames.hasMoreElements()){
                            // 请求头名称 Authorization
                            String name = headerNames.nextElement();
                            // 请求头数据 "Bearer b1dbb4cf-7de6-41e5-99e2-0e8b7e8fe6ee"
                            String value = request.getHeader(name);
                            requestTemplate.header(name,value);
                        }
                    }
                }
            }
        };

        /*return requestTemplate -> {
            // 获取所有浏览器发送的请求属性，请求头赋值到feign

            // 请求属性
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            if (attributes!=null){
                HttpServletRequest request = attributes.getRequest();
                // 获取浏览器发起的请求头
                Enumeration<String> headerNames = request.getHeaderNames();
                if(headerNames!=null){
                    while (headerNames.hasMoreElements()){
                        // 请求头名称 Authorization
                        String name = headerNames.nextElement();
                        // 请求头数据 "Bearer b1dbb4cf-7de6-41e5-99e2-0e8b7e8fe6ee"
                        String value = request.getHeader(name);
                        requestTemplate.header(name,value);
                    }
                }
            }
        };*/
    }
}
